61087921723 has 4 divisors (see below), whose sum is σ = 61492477648. Its totient is φ = 60683365800.

The previous prime is 61087921717. The next prime is 61087921729. The reversal of 61087921723 is 32712978016.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (61087921717) and next prime (61087921729).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61087921723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61087921729) 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, 202277736 + ... + 202278037.

It is an arithmetic number, because the mean of its divisors is an integer number (15373119412).

Almost surely, 2^61087921723 is an apocalyptic number.

61087921723 is a deficient number, since it is larger than the sum of its proper divisors (404555925).

61087921723 is a wasteful number, since it uses less digits than its factorization.

61087921723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404555924.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 61087921723 in words is "sixty-one billion, eighty-seven million, nine hundred twenty-one thousand, seven hundred twenty-three".