611721072634542 has 16 divisors (see below), whose sum is σ = 1317553079520720. Its totient is φ = 188221868502912.

The previous prime is 611721072634541. The next prime is 611721072634561. The reversal of 611721072634542 is 245436270127116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611721072634541) 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, 3921288927067 + ... + 3921288927222.

It is an arithmetic number, because the mean of its divisors is an integer number (82347067470045).

Almost surely, 2^{611721072634542} is an apocalyptic number.

611721072634542 is an abundant number, since it is smaller than the sum of its proper divisors (705832006886178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

611721072634542 is a wasteful number, since it uses less digits than its factorization.

611721072634542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7842577854307.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 611721072634542 in words is "six hundred eleven trillion, seven hundred twenty-one billion, seventy-two million, six hundred thirty-four thousand, five hundred forty-two".