25517067456 has 112 divisors (see below), whose sum is σ = 71556152544. Its totient is φ = 7997423616.

The previous prime is 25517067449. The next prime is 25517067461. The reversal of 25517067456 is 65476071552.

It is a super-2 number, since 2×25517067456² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3890676 + ... + 3897228.

Almost surely, 2^25517067456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25517067456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35778076272).

25517067456 is an abundant number, since it is smaller than the sum of its proper divisors (46039085088).

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

25517067456 is a wasteful number, since it uses less digits than its factorization.

25517067456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7778 (or 7768 counting only the distinct ones).

The product of its (nonzero) digits is 1764000, while the sum is 48.

The spelling of 25517067456 in words is "twenty-five billion, five hundred seventeen million, sixty-seven thousand, four hundred fifty-six".