61549154557 has 16 divisors (see below), whose sum is σ = 68100738048. Its totient is φ = 55159861680.

The previous prime is 61549154539. The next prime is 61549154593. The reversal of 61549154557 is 75545194516.

It is a de Polignac number, because none of the positive numbers 2^k-61549154557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61549154057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349918 + ... + 495520.

It is an arithmetic number, because the mean of its divisors is an integer number (4256296128).

Almost surely, 2^61549154557 is an apocalyptic number.

It is an amenable number.

61549154557 is a deficient number, since it is larger than the sum of its proper divisors (6551583491).

61549154557 is a wasteful number, since it uses less digits than its factorization.

61549154557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146160.

The product of its digits is 3780000, while the sum is 52.

The spelling of 61549154557 in words is "sixty-one billion, five hundred forty-nine million, one hundred fifty-four thousand, five hundred fifty-seven".