61811542508 has 6 divisors (see below), whose sum is σ = 108170199396. Its totient is φ = 30905771252.

The previous prime is 61811542459. The next prime is 61811542523. The reversal of 61811542508 is 80524511816.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7726442810 + ... + 7726442817.

It is an arithmetic number, because the mean of its divisors is an integer number (18028366566).

Almost surely, 2^61811542508 is an apocalyptic number.

It is an amenable number.

61811542508 is a deficient number, since it is larger than the sum of its proper divisors (46358656888).

61811542508 is a wasteful number, since it uses less digits than its factorization.

61811542508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15452885631 (or 15452885629 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 41.

The spelling of 61811542508 in words is "sixty-one billion, eight hundred eleven million, five hundred forty-two thousand, five hundred eight".