1663373670 has 64 divisors (see below), whose sum is σ = 4830782976. Its totient is φ = 357834240.

The previous prime is 1663373651. The next prime is 1663373671. The reversal of 1663373670 is 763733661.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663373671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 229396 + ... + 236535.

It is an arithmetic number, because the mean of its divisors is an integer number (75480984).

Almost surely, 2^1663373670 is an apocalyptic number.

1663373670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1663373670 is an abundant number, since it is smaller than the sum of its proper divisors (3167409306).

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

1663373670 is a wasteful number, since it uses less digits than its factorization.

1663373670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465965.

The product of its (nonzero) digits is 285768, while the sum is 42.

The square root of 1663373670 is about 40784.4782975092. The cubic root of 1663373670 is about 1184.8497308073.

The spelling of 1663373670 in words is "one billion, six hundred sixty-three million, three hundred seventy-three thousand, six hundred seventy".