1552617661 has 16 divisors (see below), whose sum is σ = 1868918400. Its totient is φ = 1260024768.

The previous prime is 1552617659. The next prime is 1552617673. The reversal of 1552617661 is 1667162551.

It is a cyclic number.

It is not a de Polignac number, because 1552617661 - 2¹ = 1552617659 is a prime.

It is a super-2 number, since 2×1552617661² = 4821243202498221842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1552617061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384891 + ... + 388903.

It is an arithmetic number, because the mean of its divisors is an integer number (116807400).

Almost surely, 2^1552617661 is an apocalyptic number.

It is an amenable number.

1552617661 is a deficient number, since it is larger than the sum of its proper divisors (316300739).

1552617661 is a wasteful number, since it uses less digits than its factorization.

1552617661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948.

The product of its digits is 75600, while the sum is 40.

The square root of 1552617661 is about 39403.2696739750. The cubic root of 1552617661 is about 1157.9456457535.

The spelling of 1552617661 in words is "one billion, five hundred fifty-two million, six hundred seventeen thousand, six hundred sixty-one".