61115665400 has 24 divisors (see below), whose sum is σ = 142093922520. Its totient is φ = 24446266080.

The previous prime is 61115665393. The next prime is 61115665427. The reversal of 61115665400 is 456651116.

It is a super-3 number, since 3×61115665400³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 152788964 + ... + 152789363.

It is an arithmetic number, because the mean of its divisors is an integer number (5920580105).

Almost surely, 2^61115665400 is an apocalyptic number.

It is an amenable number.

61115665400 is an abundant number, since it is smaller than the sum of its proper divisors (80978257120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61115665400 is a wasteful number, since it uses less digits than its factorization.

61115665400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305578343 (or 305578334 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 61115665400 in words is "sixty-one billion, one hundred fifteen million, six hundred sixty-five thousand, four hundred".