1621161063 has 12 divisors (see below), whose sum is σ = 2369891160. Its totient is φ = 1067752176.

The previous prime is 1621161041. The next prime is 1621161067. The reversal of 1621161063 is 3601611261.

It is not a de Polignac number, because 1621161063 - 2¹⁶ = 1621095527 is a prime.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1084368 + ... + 1085861.

It is an arithmetic number, because the mean of its divisors is an integer number (197490930).

Almost surely, 2^1621161063 is an apocalyptic number.

1621161063 is a deficient number, since it is larger than the sum of its proper divisors (748730097).

1621161063 is a wasteful number, since it uses less digits than its factorization.

1621161063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170318 (or 2170315 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1621161063 is about 40263.6444326641. The cubic root of 1621161063 is about 1174.7408060848.

The spelling of 1621161063 in words is "one billion, six hundred twenty-one million, one hundred sixty-one thousand, sixty-three".