1551379968 has 60 divisors (see below), whose sum is σ = 4477400928. Its totient is φ = 517125120.

The previous prime is 1551379943. The next prime is 1551379979. The reversal of 1551379968 is 8699731551.

It is a super-2 number, since 2×1551379968² = 4813559610223362048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163728 + ... + 172943.

Almost surely, 2^1551379968 is an apocalyptic number.

1551379968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1551379968 is an abundant number, since it is smaller than the sum of its proper divisors (2926020960).

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

1551379968 is an equidigital number, since it uses as much as digits as its factorization.

1551379968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336695 (or 336676 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 54.

The square root of 1551379968 is about 39387.5610821488. The cubic root of 1551379968 is about 1157.6378725753.

It can be divided in two parts, 15513 and 79968, that added together give a square (95481 = 309²).

The spelling of 1551379968 in words is "one billion, five hundred fifty-one million, three hundred seventy-nine thousand, nine hundred sixty-eight".