61731477645 has 16 divisors (see below), whose sum is σ = 98781716160. Its totient is φ = 32919670784.

The previous prime is 61731477617. The next prime is 61731477653. The reversal of 61731477645 is 54677413716.

It is a cyclic number.

It is not a de Polignac number, because 61731477645 - 2⁷ = 61731477517 is a prime.

It is a super-3 number, since 3×61731477645³ (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 15 ways as a sum of consecutive naturals, for example, 99060 + ... + 365069.

It is an arithmetic number, because the mean of its divisors is an integer number (6173857260).

Almost surely, 2^61731477645 is an apocalyptic number.

It is an amenable number.

61731477645 is a deficient number, since it is larger than the sum of its proper divisors (37050238515).

61731477645 is a wasteful number, since it uses less digits than its factorization.

61731477645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473004.

The product of its digits is 2963520, while the sum is 51.

The spelling of 61731477645 in words is "sixty-one billion, seven hundred thirty-one million, four hundred seventy-seven thousand, six hundred forty-five".