61612520765777 has 16 divisors (see below), whose sum is σ = 62265858798528. Its totient is φ = 60960039940800.

The previous prime is 61612520765723. The next prime is 61612520765779. The reversal of 61612520765777 is 77756702521616.

It is a cyclic number.

It is not a de Polignac number, because 61612520765777 - 2¹² = 61612520761681 is a prime.

It is a super-2 number, since 2×61612520765777² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61612520765779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3215171798 + ... + 3215190960.

It is an arithmetic number, because the mean of its divisors is an integer number (3891616174908).

Almost surely, 2^{61612520765777} is an apocalyptic number.

It is an amenable number.

61612520765777 is a deficient number, since it is larger than the sum of its proper divisors (653338032751).

61612520765777 is a wasteful number, since it uses less digits than its factorization.

61612520765777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39760.

The product of its (nonzero) digits is 51861600, while the sum is 62.

The spelling of 61612520765777 in words is "sixty-one trillion, six hundred twelve billion, five hundred twenty million, seven hundred sixty-five thousand, seven hundred seventy-seven".