61445861157 has 8 divisors (see below), whose sum is σ = 86747098176. Its totient is φ = 38554265792.

The previous prime is 61445861149. The next prime is 61445861161. The reversal of 61445861157 is 75116854416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61445861157 - 2³ = 61445861149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61445841157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602410353 + ... + 602410454.

It is an arithmetic number, because the mean of its divisors is an integer number (10843387272).

Almost surely, 2^61445861157 is an apocalyptic number.

It is an amenable number.

61445861157 is a deficient number, since it is larger than the sum of its proper divisors (25301237019).

61445861157 is a wasteful number, since it uses less digits than its factorization.

61445861157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204820827.

The product of its digits is 806400, while the sum is 48.

The spelling of 61445861157 in words is "sixty-one billion, four hundred forty-five million, eight hundred sixty-one thousand, one hundred fifty-seven".