99971561339724 has 24 divisors (see below), whose sum is σ = 233274080730880. Its totient is φ = 33322838883984.

The previous prime is 99971561339723. The next prime is 99971561339729. The reversal of 99971561339724 is 42793316517999.

It is not an unprimeable number, because it can be changed into a prime (99971561339723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126451504 + ... + 127239639.

Almost surely, 2^{99971561339724} is an apocalyptic number.

It is an amenable number.

99971561339724 is an abundant number, since it is smaller than the sum of its proper divisors (133302519391156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99971561339724 is a wasteful number, since it uses less digits than its factorization.

99971561339724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253723989 (or 253723987 counting only the distinct ones).

The product of its digits is 694416240, while the sum is 75.

The spelling of 99971561339724 in words is "ninety-nine trillion, nine hundred seventy-one billion, five hundred sixty-one million, three hundred thirty-nine thousand, seven hundred twenty-four".