61500165001 has 4 divisors (see below), whose sum is σ = 67091089104. Its totient is φ = 55909240900.

The previous prime is 61500164989. The next prime is 61500165031. The reversal of 61500165001 is 10056100516.

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 61500165001 - 2²¹ = 61498067849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61500165031) 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, 2795462035 + ... + 2795462056.

It is an arithmetic number, because the mean of its divisors is an integer number (16772772276).

Almost surely, 2^61500165001 is an apocalyptic number.

It is an amenable number.

61500165001 is a deficient number, since it is larger than the sum of its proper divisors (5590924103).

61500165001 is a wasteful number, since it uses less digits than its factorization.

61500165001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5590924102.

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 61500165001 its reverse (10056100516), we get a palindrome (71556265517).

The spelling of 61500165001 in words is "sixty-one billion, five hundred million, one hundred sixty-five thousand, one".