861722039145 has 48 divisors (see below), whose sum is σ = 1581382325376. Its totient is φ = 399639187200.

The previous prime is 861722039119. The next prime is 861722039149. The reversal of 861722039145 is 541930227168.

It is not a de Polignac number, because 861722039145 - 2⁶ = 861722039081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861722039094 and 861722039103.

It is not an unprimeable number, because it can be changed into a prime (861722039149) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10279516 + ... + 10363005.

It is an arithmetic number, because the mean of its divisors is an integer number (32945465112).

It is a 1-persistent number, because it is pandigital, but 2⋅861722039145 = 1723444078290 is not.

Almost surely, 2^861722039145 is an apocalyptic number.

It is an amenable number.

861722039145 is a deficient number, since it is larger than the sum of its proper divisors (719660286231).

861722039145 is a wasteful number, since it uses less digits than its factorization.

861722039145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20642574 (or 20642563 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 861722039145 in words is "eight hundred sixty-one billion, seven hundred twenty-two million, thirty-nine thousand, one hundred forty-five".