77863755513601 has 8 divisors (see below), whose sum is σ = 78061048998120. Its totient is φ = 77666467874688.

The previous prime is 77863755513581. The next prime is 77863755513653. The reversal of 77863755513601 is 10631555736877.

It can be written as a sum of positive squares in 4 ways, for example, as 19514094210576 + 58349661303025 = 4417476^2 + 7638695^2 .

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 77863755513601 - 2¹⁷ = 77863755382529 is a prime.

It is a super-3 number, since 3×77863755513601³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77863755513701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25858575 + ... + 28712251.

It is an arithmetic number, because the mean of its divisors is an integer number (9757631124765).

Almost surely, 2^{77863755513601} is an apocalyptic number.

It is an amenable number.

77863755513601 is a deficient number, since it is larger than the sum of its proper divisors (197293484519).

77863755513601 is a wasteful number, since it uses less digits than its factorization.

77863755513601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922803.

The product of its (nonzero) digits is 111132000, while the sum is 64.

The spelling of 77863755513601 in words is "seventy-seven trillion, eight hundred sixty-three billion, seven hundred fifty-five million, five hundred thirteen thousand, six hundred one".