1691402553 has 40 divisors (see below), whose sum is σ = 2675977920. Its totient is φ = 1061696160.

The previous prime is 1691402551. The next prime is 1691402567. The reversal of 1691402553 is 3552041961.

1691402553 is a `hidden beast` number, since 1 + 69 + 1 + 40 + 2 + 553 = 666.

It is not a de Polignac number, because 1691402553 - 2¹ = 1691402551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1691402551) 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 39 ways as a sum of consecutive naturals, for example, 253723 + ... + 260303.

It is an arithmetic number, because the mean of its divisors is an integer number (66899448).

Almost surely, 2^1691402553 is an apocalyptic number.

It is an amenable number.

1691402553 is a deficient number, since it is larger than the sum of its proper divisors (984575367).

1691402553 is a wasteful number, since it uses less digits than its factorization.

1691402553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779 (or 6770 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 1691402553 is about 41126.6647444210. The cubic root of 1691402553 is about 1191.4678478442.

The spelling of 1691402553 in words is "one billion, six hundred ninety-one million, four hundred two thousand, five hundred fifty-three".