1681624552 has 8 divisors (see below), whose sum is σ = 3153046050. Its totient is φ = 840812272.

The previous prime is 1681624541. The next prime is 1681624559. The reversal of 1681624552 is 2554261861.

It can be written as a sum of positive squares in only one way, i.e., 1423251076 + 258373476 = 37726^2 + 16074^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1681624552² = 5655722267778401408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1681624559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105101527 + ... + 105101542.

Almost surely, 2^1681624552 is an apocalyptic number.

It is an amenable number.

1681624552 is a deficient number, since it is larger than the sum of its proper divisors (1471421498).

1681624552 is a wasteful number, since it uses less digits than its factorization.

1681624552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210203075 (or 210203071 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

The square root of 1681624552 is about 41007.6157804864. The cubic root of 1681624552 is about 1189.1674500552.

The spelling of 1681624552 in words is "one billion, six hundred eighty-one million, six hundred twenty-four thousand, five hundred fifty-two".