61729017854 has 16 divisors (see below), whose sum is σ = 106195106688. Its totient is φ = 26361810072.

The previous prime is 61729017851. The next prime is 61729017899. The reversal of 61729017854 is 45871092716.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61729017851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7786172 + ... + 7794095.

It is an arithmetic number, because the mean of its divisors is an integer number (6637194168).

Almost surely, 2^61729017854 is an apocalyptic number.

61729017854 is a deficient number, since it is larger than the sum of its proper divisors (44466088834).

61729017854 is a wasteful number, since it uses less digits than its factorization.

61729017854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15580559.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 61729017854 in words is "sixty-one billion, seven hundred twenty-nine million, seventeen thousand, eight hundred fifty-four".