61153863808 has 16 divisors (see below), whose sum is σ = 121829963310. Its totient is φ = 30576931840.

The previous prime is 61153863803. The next prime is 61153863839. The reversal of 61153863808 is 80836835116.

It can be written as a sum of positive squares in only one way, i.e., 60244720704 + 909143104 = 245448^2 + 30152^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (61153863803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238882153 + ... + 238882408.

Almost surely, 2^61153863808 is an apocalyptic number.

It is an amenable number.

61153863808 is a deficient number, since it is larger than the sum of its proper divisors (60676099502).

61153863808 is an equidigital number, since it uses as much as digits as its factorization.

61153863808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477764575 (or 477764563 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 61153863808 in words is "sixty-one billion, one hundred fifty-three million, eight hundred sixty-three thousand, eight hundred eight".