77770720633 has 4 divisors (see below), whose sum is σ = 78383088640. Its totient is φ = 77158352628.

The previous prime is 77770720627. The next prime is 77770720649. The reversal of 77770720633 is 33602707777.

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.

It is a cyclic number.

It is not a de Polignac number, because 77770720633 - 2²¹ = 77768623481 is a prime.

It is a super-2 number, since 2×77770720633² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77770720693) 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, 306183813 + ... + 306184066.

It is an arithmetic number, because the mean of its divisors is an integer number (19595772160).

Almost surely, 2^77770720633 is an apocalyptic number.

It is an amenable number.

77770720633 is a deficient number, since it is larger than the sum of its proper divisors (612368007).

77770720633 is a wasteful number, since it uses less digits than its factorization.

77770720633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612368006.

The product of its (nonzero) digits is 1815156, while the sum is 49.

The spelling of 77770720633 in words is "seventy-seven billion, seven hundred seventy million, seven hundred twenty thousand, six hundred thirty-three".