61005388542 has 32 divisors (see below), whose sum is σ = 141351044352. Its totient is φ = 17191341504.

The previous prime is 61005388519. The next prime is 61005388571. The reversal of 61005388542 is 24588350016.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 61005388494 and 61005388503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9945628 + ... + 9951759.

It is an arithmetic number, because the mean of its divisors is an integer number (4417220136).

Almost surely, 2^61005388542 is an apocalyptic number.

61005388542 is an abundant number, since it is smaller than the sum of its proper divisors (80345655810).

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

61005388542 is a wasteful number, since it uses less digits than its factorization.

61005388542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19897472.

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 61005388542 in words is "sixty-one billion, five million, three hundred eighty-eight thousand, five hundred forty-two".