61431205165 has 8 divisors (see below), whose sum is σ = 80419032288. Its totient is φ = 44677240080.

The previous prime is 61431205133. The next prime is 61431205189. The reversal of 61431205165 is 56150213416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61431205165 - 2⁵ = 61431205133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61431205165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 558465447 + ... + 558465556.

It is an arithmetic number, because the mean of its divisors is an integer number (10052379036).

Almost surely, 2^61431205165 is an apocalyptic number.

It is an amenable number.

61431205165 is a deficient number, since it is larger than the sum of its proper divisors (18987827123).

61431205165 is a wasteful number, since it uses less digits than its factorization.

61431205165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116931019.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 61431205165 in words is "sixty-one billion, four hundred thirty-one million, two hundred five thousand, one hundred sixty-five".