1664537250 has 64 divisors (see below), whose sum is σ = 4288766976. Its totient is φ = 429552000.

The previous prime is 1664537227. The next prime is 1664537279. The reversal of 1664537250 is 527354661.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1664537199 and 1664537208.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12547 + ... + 59046.

It is an arithmetic number, because the mean of its divisors is an integer number (67011984).

Almost surely, 2^1664537250 is an apocalyptic number.

1664537250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1664537250 is an abundant number, since it is smaller than the sum of its proper divisors (2624229726).

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

1664537250 is a wasteful number, since it uses less digits than its factorization.

1664537250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71644 (or 71634 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 1664537250 is about 40798.7407893920. The cubic root of 1664537250 is about 1185.1259457726.

The spelling of 1664537250 in words is "one billion, six hundred sixty-four million, five hundred thirty-seven thousand, two hundred fifty".