24922987981 has 2 divisors, whose sum is σ = 24922987982. Its totient is φ = 24922987980.

The previous prime is 24922987961. The next prime is 24922987987. The reversal of 24922987981 is 18978922942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13574347081 + 11348640900 = 116509^2 + 106530^2 .

It is a cyclic number.

It is not a de Polignac number, because 24922987981 - 2⁵ = 24922987949 is a prime.

It is a super-2 number, since 2×24922987981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24922987987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12461493990 + 12461493991.

It is an arithmetic number, because the mean of its divisors is an integer number (12461493991).

Almost surely, 2^24922987981 is an apocalyptic number.

It is an amenable number.

24922987981 is a deficient number, since it is larger than the sum of its proper divisors (1).

24922987981 is an equidigital number, since it uses as much as digits as its factorization.

24922987981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 61.

The spelling of 24922987981 in words is "twenty-four billion, nine hundred twenty-two million, nine hundred eighty-seven thousand, nine hundred eighty-one".