61637681373 has 32 divisors (see below), whose sum is σ = 85179524352. Its totient is φ = 39628224000.

The previous prime is 61637681333. The next prime is 61637681377. The reversal of 61637681373 is 37318673616.

It is not a de Polignac number, because 61637681373 - 2²⁹ = 61100810461 is a prime.

It is a super-3 number, since 3×61637681373³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61637681377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1887561 + ... + 1919937.

It is an arithmetic number, because the mean of its divisors is an integer number (2661860136).

Almost surely, 2^61637681373 is an apocalyptic number.

It is an amenable number.

61637681373 is a deficient number, since it is larger than the sum of its proper divisors (23541842979).

61637681373 is a wasteful number, since it uses less digits than its factorization.

61637681373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32645.

The product of its digits is 2286144, while the sum is 51.

The spelling of 61637681373 in words is "sixty-one billion, six hundred thirty-seven million, six hundred eighty-one thousand, three hundred seventy-three".