61551015101 has 4 divisors (see below), whose sum is σ = 61570815900. Its totient is φ = 61531214304.

The previous prime is 61551015073. The next prime is 61551015179. The reversal of 61551015101 is 10151015516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8316528025 + 53234487076 = 91195^2 + 230726^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61551015101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61551015401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9895736 + ... + 9901953.

It is an arithmetic number, because the mean of its divisors is an integer number (15392703975).

Almost surely, 2^61551015101 is an apocalyptic number.

It is an amenable number.

61551015101 is a deficient number, since it is larger than the sum of its proper divisors (19800799).

61551015101 is a wasteful number, since it uses less digits than its factorization.

61551015101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19800798.

The product of its (nonzero) digits is 750, while the sum is 26.

The spelling of 61551015101 in words is "sixty-one billion, five hundred fifty-one million, fifteen thousand, one hundred one".