400155515116 has 72 divisors (see below), whose sum is σ = 839143443600. Its totient is φ = 166382229888.

The previous prime is 400155515107. The next prime is 400155515119. The reversal of 400155515116 is 611515551004.

It is not an unprimeable number, because it can be changed into a prime (400155515119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1096446 + ... + 1415098.

It is an arithmetic number, because the mean of its divisors is an integer number (11654770050).

Almost surely, 2^400155515116 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 400155515116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419571721800).

400155515116 is an abundant number, since it is smaller than the sum of its proper divisors (438987928484).

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

400155515116 is a wasteful number, since it uses less digits than its factorization.

400155515116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318863 (or 318854 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 34.

The spelling of 400155515116 in words is "four hundred billion, one hundred fifty-five million, five hundred fifteen thousand, one hundred sixteen".