664157851 has 8 divisors (see below), whose sum is σ = 761190624. Its totient is φ = 567663360.

The previous prime is 664157827. The next prime is 664157861. The reversal of 664157851 is 158751466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664157851 - 2¹⁹ = 663633563 is a prime.

It is a super-2 number, since 2×664157851² = 882211302089876402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664157798 and 664157807.

It is not an unprimeable number, because it can be changed into a prime (664157861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131920 + ... + 136861.

It is an arithmetic number, because the mean of its divisors is an integer number (95148828).

Almost surely, 2^664157851 is an apocalyptic number.

664157851 is a deficient number, since it is larger than the sum of its proper divisors (97032773).

664157851 is a wasteful number, since it uses less digits than its factorization.

664157851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269141.

The product of its digits is 201600, while the sum is 43.

The square root of 664157851 is about 25771.2601748537. The cubic root of 664157851 is about 872.4832610642.

The spelling of 664157851 in words is "six hundred sixty-four million, one hundred fifty-seven thousand, eight hundred fifty-one".