625561451616 has 96 divisors (see below), whose sum is σ = 1739673936000. Its totient is φ = 196143835136.

The previous prime is 625561451587. The next prime is 625561451693. The reversal of 625561451616 is 616154165526.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×625561451616² (a number of 24 digits) contains 22 as substring.

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

It is a congruent number.

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, 2809135 + ... + 3023633.

It is an arithmetic number, because the mean of its divisors is an integer number (18121603500).

Almost surely, 2^625561451616 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 625561451616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (869836968000).

625561451616 is an abundant number, since it is smaller than the sum of its proper divisors (1114112484384).

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

625561451616 is a wasteful number, since it uses less digits than its factorization.

625561451616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216316 (or 216308 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 48.

The spelling of 625561451616 in words is "six hundred twenty-five billion, five hundred sixty-one million, four hundred fifty-one thousand, six hundred sixteen".