25437160981 has 8 divisors (see below), whose sum is σ = 25841403224. Its totient is φ = 25035816960.

The previous prime is 25437160951. The next prime is 25437161023. The reversal of 25437160981 is 18906173452.

It can be written as a sum of positive squares in 4 ways, for example, as 1093360356 + 24343800625 = 33066^2 + 156025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 7-Lehmer number, since φ(25437160981) divides (25437160981-1)⁷.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25437160981 is a prime.

It is a super-2 number, since 2×25437160981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25437160901) 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, 706860 + ... + 741973.

It is an arithmetic number, because the mean of its divisors is an integer number (3230175403).

It is a 2-persistent number, because it is pandigital, and so is 2⋅25437160981 = 50874321962, but 3⋅25437160981 = 76311482943 is not.

Almost surely, 2^25437160981 is an apocalyptic number.

It is an amenable number.

25437160981 is a deficient number, since it is larger than the sum of its proper divisors (404242243).

25437160981 is a wasteful number, since it uses less digits than its factorization.

25437160981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449111.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 25437160981 in words is "twenty-five billion, four hundred thirty-seven million, one hundred sixty thousand, nine hundred eighty-one".