1615401660 has 48 divisors (see below), whose sum is σ = 4761187200. Its totient is φ = 408101184.

The previous prime is 1615401653. The next prime is 1615401673. The reversal of 1615401660 is 661045161.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 707370 + ... + 709649.

It is an arithmetic number, because the mean of its divisors is an integer number (99191400).

Almost surely, 2^1615401660 is an apocalyptic number.

1615401660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1615401660 is an abundant number, since it is smaller than the sum of its proper divisors (3145785540).

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

1615401660 is a wasteful number, since it uses less digits than its factorization.

1615401660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417050 (or 1417048 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1615401660 is about 40192.0596635704. The cubic root of 1615401660 is about 1173.3480113594.

The spelling of 1615401660 in words is "one billion, six hundred fifteen million, four hundred one thousand, six hundred sixty".