551401266 has 64 divisors (see below), whose sum is σ = 1212865920. Its totient is φ = 166095360.

The previous prime is 551401237. The next prime is 551401271. The reversal of 551401266 is 662104155.

It is a super-2 number, since 2×551401266² = 608086712292805512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1018956 + ... + 1019496.

It is an arithmetic number, because the mean of its divisors is an integer number (18951030).

Almost surely, 2^551401266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551401266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (606432960).

551401266 is an abundant number, since it is smaller than the sum of its proper divisors (661464654).

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

551401266 is a wasteful number, since it uses less digits than its factorization.

551401266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 551401266 is about 23481.9348862056. The cubic root of 551401266 is about 820.0164908442.

The spelling of 551401266 in words is "five hundred fifty-one million, four hundred one thousand, two hundred sixty-six".