78632553537 has 6 divisors (see below), whose sum is σ = 113580355122. Its totient is φ = 52421702352.

The previous prime is 78632553533. The next prime is 78632553547. The reversal of 78632553537 is 73535523687.

78632553537 is a `hidden beast` number, since 7 + 8 + 6 + 32 + 553 + 53 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 41943449601 + 36689103936 = 204801^2 + 191544^2 .

It is not a de Polignac number, because 78632553537 - 2² = 78632553533 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78632553533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4368475188 + ... + 4368475205.

It is an arithmetic number, because the mean of its divisors is an integer number (18930059187).

Almost surely, 2^78632553537 is an apocalyptic number.

It is an amenable number.

78632553537 is a deficient number, since it is larger than the sum of its proper divisors (34947801585).

78632553537 is a wasteful number, since it uses less digits than its factorization.

78632553537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8736950399 (or 8736950396 counting only the distinct ones).

The product of its digits is 15876000, while the sum is 54.

The spelling of 78632553537 in words is "seventy-eight billion, six hundred thirty-two million, five hundred fifty-three thousand, five hundred thirty-seven".