669801018457 has 4 divisors (see below), whose sum is σ = 674619730960. Its totient is φ = 664982305956.

The previous prime is 669801018443. The next prime is 669801018461. The reversal of 669801018457 is 754810108966.

669801018457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 754810108966 = 2 ⋅377405054483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669801018457 is a prime.

It is a super-3 number, since 3×669801018457³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669801018398 and 669801018407.

It is not an unprimeable number, because it can be changed into a prime (669801058457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2409356043 + ... + 2409356320.

It is an arithmetic number, because the mean of its divisors is an integer number (168654932740).

Almost surely, 2^669801018457 is an apocalyptic number.

It is an amenable number.

669801018457 is a deficient number, since it is larger than the sum of its proper divisors (4818712503).

669801018457 is a wasteful number, since it uses less digits than its factorization.

669801018457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4818712502.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 669801018457 in words is "six hundred sixty-nine billion, eight hundred one million, eighteen thousand, four hundred fifty-seven".