23687720451 has 12 divisors (see below), whose sum is σ = 36016417320. Its totient is φ = 14960665440.

The previous prime is 23687720449. The next prime is 23687720461. The reversal of 23687720451 is 15402778632.

It is not a de Polignac number, because 23687720451 - 2¹ = 23687720449 is a prime.

It is a super-2 number, since 2×23687720451² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23687720397 and 23687720406.

It is not an unprimeable number, because it can be changed into a prime (23687720461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69262170 + ... + 69262511.

It is an arithmetic number, because the mean of its divisors is an integer number (3001368110).

Almost surely, 2^23687720451 is an apocalyptic number.

23687720451 is a deficient number, since it is larger than the sum of its proper divisors (12328696869).

23687720451 is a wasteful number, since it uses less digits than its factorization.

23687720451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138524706 (or 138524703 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 23687720451 in words is "twenty-three billion, six hundred eighty-seven million, seven hundred twenty thousand, four hundred fifty-one".