25615256122 has 4 divisors (see below), whose sum is σ = 38422884186. Its totient is φ = 12807628060.

The previous prime is 25615256113. The next prime is 25615256123. The reversal of 25615256122 is 22165251652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17450145801 + 8165110321 = 132099^2 + 90361^2 .

It is a super-2 number, since 2×25615256122² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25615256123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6403814029 + ... + 6403814032.

Almost surely, 2^25615256122 is an apocalyptic number.

25615256122 is a deficient number, since it is larger than the sum of its proper divisors (12807628064).

25615256122 is a wasteful number, since it uses less digits than its factorization.

25615256122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12807628063.

The product of its digits is 72000, while the sum is 37.

The spelling of 25615256122 in words is "twenty-five billion, six hundred fifteen million, two hundred fifty-six thousand, one hundred twenty-two".