61572944937 has 16 divisors (see below), whose sum is σ = 95740246400. Its totient is φ = 35184539376.

The previous prime is 61572944921. The next prime is 61572944941. The reversal of 61572944937 is 73944927516.

It is a happy number.

It is not a de Polignac number, because 61572944937 - 2⁴ = 61572944921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61572944437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29917798 + ... + 29919855.

It is an arithmetic number, because the mean of its divisors is an integer number (5983765400).

Almost surely, 2^61572944937 is an apocalyptic number.

It is an amenable number.

61572944937 is a deficient number, since it is larger than the sum of its proper divisors (34167301463).

61572944937 is an equidigital number, since it uses as much as digits as its factorization.

61572944937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59837677 (or 59837663 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 57.

The spelling of 61572944937 in words is "sixty-one billion, five hundred seventy-two million, nine hundred forty-four thousand, nine hundred thirty-seven".