1551557064 has 32 divisors (see below), whose sum is σ = 3887226720. Its totient is φ = 516074496.

The previous prime is 1551557047. The next prime is 1551557153. The reversal of 1551557064 is 4607551551.

It is a happy number.

1551557064 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58009 + ... + 80424.

It is an arithmetic number, because the mean of its divisors is an integer number (121475835).

Almost surely, 2^1551557064 is an apocalyptic number.

It is an amenable number.

1551557064 is an abundant number, since it is smaller than the sum of its proper divisors (2335669656).

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

1551557064 is a wasteful number, since it uses less digits than its factorization.

1551557064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138909 (or 138905 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 39.

The square root of 1551557064 is about 39389.8091389131. The cubic root of 1551557064 is about 1157.6819205069.

The spelling of 1551557064 in words is "one billion, five hundred fifty-one million, five hundred fifty-seven thousand, sixty-four".