61691753571 has 24 divisors (see below), whose sum is σ = 95701217040. Its totient is φ = 35246518272.

The previous prime is 61691753561. The next prime is 61691753573. The reversal of 61691753571 is 17535719616.

It is a happy number.

It is not a de Polignac number, because 61691753571 - 2¹⁵ = 61691720803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61691753573) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 934915 + ... + 998723.

It is an arithmetic number, because the mean of its divisors is an integer number (3987550710).

Almost surely, 2^61691753571 is an apocalyptic number.

61691753571 is a deficient number, since it is larger than the sum of its proper divisors (34009463469).

61691753571 is a wasteful number, since it uses less digits than its factorization.

61691753571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70403 (or 70396 counting only the distinct ones).

The product of its digits is 1190700, while the sum is 51.

The spelling of 61691753571 in words is "sixty-one billion, six hundred ninety-one million, seven hundred fifty-three thousand, five hundred seventy-one".