1220657475 has 12 divisors (see below), whose sum is σ = 2018153816. Its totient is φ = 651017280.

The previous prime is 1220657461. The next prime is 1220657479. The reversal of 1220657475 is 5747560221.

It is not a de Polignac number, because 1220657475 - 2⁶ = 1220657411 is a prime.

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 Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220657479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8137642 + ... + 8137791.

Almost surely, 2^1220657475 is an apocalyptic number.

1220657475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220657475 is a deficient number, since it is larger than the sum of its proper divisors (797496341).

1220657475 is a wasteful number, since it uses less digits than its factorization.

1220657475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16275446 (or 16275441 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 39.

The square root of 1220657475 is about 34937.9088527061. The cubic root of 1220657475 is about 1068.7216441983.

The spelling of 1220657475 in words is "one billion, two hundred twenty million, six hundred fifty-seven thousand, four hundred seventy-five".