61500653521 has 4 divisors (see below), whose sum is σ = 62809178112. Its totient is φ = 60192128932.

The previous prime is 61500653509. The next prime is 61500653527. The reversal of 61500653521 is 12535600516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61500653521 - 2¹³ = 61500645329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61500653527) 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, 654262225 + ... + 654262318.

It is an arithmetic number, because the mean of its divisors is an integer number (15702294528).

Almost surely, 2^61500653521 is an apocalyptic number.

It is an amenable number.

61500653521 is a deficient number, since it is larger than the sum of its proper divisors (1308524591).

61500653521 is a wasteful number, since it uses less digits than its factorization.

61500653521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308524590.

The product of its (nonzero) digits is 27000, while the sum is 34.

The spelling of 61500653521 in words is "sixty-one billion, five hundred million, six hundred fifty-three thousand, five hundred twenty-one".