1651399660 has 12 divisors (see below), whose sum is σ = 3467939328. Its totient is φ = 660559856.

The previous prime is 1651399657. The next prime is 1651399733. The reversal of 1651399660 is 669931561.

It is a self number, because there is not a number n which added to its sum of digits gives 1651399660.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41284972 + ... + 41285011.

It is an arithmetic number, because the mean of its divisors is an integer number (288994944).

Almost surely, 2^1651399660 is an apocalyptic number.

1651399660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1651399660 is an abundant number, since it is smaller than the sum of its proper divisors (1816539668).

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

1651399660 is a wasteful number, since it uses less digits than its factorization.

1651399660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82569992 (or 82569990 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 1651399660 is about 40637.4169946861. The cubic root of 1651399660 is about 1181.9997833645. Note that the first 3 decimals are identical.

The spelling of 1651399660 in words is "one billion, six hundred fifty-one million, three hundred ninety-nine thousand, six hundred sixty".