7561650021 has 16 divisors (see below), whose sum is σ = 10176192000. Its totient is φ = 4994280128.

The previous prime is 7561649971. The next prime is 7561650043. The reversal of 7561650021 is 1200561657.

It is a cyclic number.

It is not a de Polignac number, because 7561650021 - 2¹⁴ = 7561633637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7561650071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152140 + ... + 195626.

It is an arithmetic number, because the mean of its divisors is an integer number (636012000).

Almost surely, 2^7561650021 is an apocalyptic number.

It is an amenable number.

7561650021 is a deficient number, since it is larger than the sum of its proper divisors (2614541979).

7561650021 is a wasteful number, since it uses less digits than its factorization.

7561650021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44028.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 7561650021 is about 86957.7484816621. The cubic root of 7561650021 is about 1962.7825621842.

The spelling of 7561650021 in words is "seven billion, five hundred sixty-one million, six hundred fifty thousand, twenty-one".