61500533021 has 8 divisors (see below), whose sum is σ = 68545486080. Its totient is φ = 54836388288.

The previous prime is 61500533009. The next prime is 61500533047. The reversal of 61500533021 is 12033500516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61500533021 is a prime.

It is a super-2 number, since 2×61500533021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61500533051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95201741 + ... + 95202386.

It is an arithmetic number, because the mean of its divisors is an integer number (8568185760).

Almost surely, 2^61500533021 is an apocalyptic number.

It is an amenable number.

61500533021 is a deficient number, since it is larger than the sum of its proper divisors (7044953059).

61500533021 is a wasteful number, since it uses less digits than its factorization.

61500533021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190404163.

The product of its (nonzero) digits is 2700, while the sum is 26.

The spelling of 61500533021 in words is "sixty-one billion, five hundred million, five hundred thirty-three thousand, twenty-one".