1640551530 has 16 divisors (see below), whose sum is σ = 3937323744. Its totient is φ = 437480400.

The previous prime is 1640551511. The next prime is 1640551541. The reversal of 1640551530 is 351550461.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 54685051 = 1640551530 / (1 + 6 + 4 + 0 + 5 + 5 + 1 + 5 + 3 + 0).

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, 27342496 + ... + 27342555.

It is an arithmetic number, because the mean of its divisors is an integer number (246082734).

Almost surely, 2^1640551530 is an apocalyptic number.

1640551530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640551530 is an abundant number, since it is smaller than the sum of its proper divisors (2296772214).

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

1640551530 is a wasteful number, since it uses less digits than its factorization.

1640551530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54685061.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1640551530 is about 40503.7224215257. The cubic root of 1640551530 is about 1179.4058892810.

The spelling of 1640551530 in words is "one billion, six hundred forty million, five hundred fifty-one thousand, five hundred thirty".