61531337405 has 16 divisors (see below), whose sum is σ = 76618929024. Its totient is φ = 47403101760.

The previous prime is 61531337359. The next prime is 61531337419. The reversal of 61531337405 is 50473313516.

It is not a de Polignac number, because 61531337405 - 2¹⁰ = 61531336381 is a prime.

It is a super-2 number, since 2×61531337405² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

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, 2000174 + ... + 2030703.

It is an arithmetic number, because the mean of its divisors is an integer number (4788683064).

Almost surely, 2^61531337405 is an apocalyptic number.

It is an amenable number.

61531337405 is a deficient number, since it is larger than the sum of its proper divisors (15087591619).

61531337405 is a wasteful number, since it uses less digits than its factorization.

61531337405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030996.

The product of its (nonzero) digits is 113400, while the sum is 38.

The spelling of 61531337405 in words is "sixty-one billion, five hundred thirty-one million, three hundred thirty-seven thousand, four hundred five".