1621161064 has 16 divisors (see below), whose sum is σ = 3040107300. Its totient is φ = 810465792.

The previous prime is 1621161041. The next prime is 1621161067. The reversal of 1621161064 is 4601611261.

It can be written as a sum of positive squares in 2 ways, for example, as 1551572100 + 69588964 = 39390^2 + 8342^2 .

It is a super-2 number, since 2×1621161064² = 5256326390859224192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1621161067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92664 + ... + 108760.

Almost surely, 2^1621161064 is an apocalyptic number.

It is an amenable number.

1621161064 is a deficient number, since it is larger than the sum of its proper divisors (1418946236).

1621161064 is a wasteful number, since it uses less digits than its factorization.

1621161064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28692 (or 28688 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1621161064 is about 40263.6444450822. The cubic root of 1621161064 is about 1174.7408063264.

The spelling of 1621161064 in words is "one billion, six hundred twenty-one million, one hundred sixty-one thousand, sixty-four".