77465561 has 4 divisors (see below), whose sum is σ = 77623824. Its totient is φ = 77307300.

The previous prime is 77465551. The next prime is 77465569. The reversal of 77465561 is 16556477.

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 77465561 - 2²² = 73271257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77465569) 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, 78395 + ... + 79376.

It is an arithmetic number, because the mean of its divisors is an integer number (19405956).

Almost surely, 2^77465561 is an apocalyptic number.

It is an amenable number.

77465561 is a deficient number, since it is larger than the sum of its proper divisors (158263).

77465561 is a wasteful number, since it uses less digits than its factorization.

77465561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158262.

The product of its digits is 176400, while the sum is 41.

The square root of 77465561 is about 8801.4522097208. The cubic root of 77465561 is about 426.2877866875.

The spelling of 77465561 in words is "seventy-seven million, four hundred sixty-five thousand, five hundred sixty-one".