2061621736 has 8 divisors (see below), whose sum is σ = 3865540770. Its totient is φ = 1030810864.

The previous prime is 2061621659. The next prime is 2061621743. The reversal of 2061621736 is 6371261602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1272348900 + 789272836 = 35670^2 + 28094^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128851351 + ... + 128851366.

Almost surely, 2^2061621736 is an apocalyptic number.

It is an amenable number.

2061621736 is a deficient number, since it is larger than the sum of its proper divisors (1803919034).

2061621736 is a wasteful number, since it uses less digits than its factorization.

2061621736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257702723 (or 257702719 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 2061621736 is about 45405.0849134764. The cubic root of 2061621736 is about 1272.7301376893.

The spelling of 2061621736 in words is "two billion, sixty-one million, six hundred twenty-one thousand, seven hundred thirty-six".