61871057545 has 16 divisors (see below), whose sum is σ = 81011145600. Its totient is φ = 44988073600.

The previous prime is 61871057527. The next prime is 61871057551. The reversal of 61871057545 is 54575017816.

It is a happy number.

It is not a de Polignac number, because 61871057545 - 2⁹ = 61871057033 is a prime.

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, 168756 + ... + 390154.

It is an arithmetic number, because the mean of its divisors is an integer number (5063196600).

Almost surely, 2^61871057545 is an apocalyptic number.

It is an amenable number.

61871057545 is a deficient number, since it is larger than the sum of its proper divisors (19140088055).

61871057545 is a wasteful number, since it uses less digits than its factorization.

61871057545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226496.

The product of its (nonzero) digits is 1176000, while the sum is 49.

The spelling of 61871057545 in words is "sixty-one billion, eight hundred seventy-one million, fifty-seven thousand, five hundred forty-five".