61521120157 has 8 divisors (see below), whose sum is σ = 74445725376. Its totient is φ = 49630483392.

The previous prime is 61521120119. The next prime is 61521120161. The reversal of 61521120157 is 75102112516.

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

It is not a de Polignac number, because 61521120157 - 2¹⁹ = 61520595869 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 (61521120457) 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, 258491983 + ... + 258492220.

It is an arithmetic number, because the mean of its divisors is an integer number (9305715672).

Almost surely, 2^61521120157 is an apocalyptic number.

It is an amenable number.

61521120157 is a deficient number, since it is larger than the sum of its proper divisors (12924605219).

61521120157 is a wasteful number, since it uses less digits than its factorization.

61521120157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516984227.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 61521120157 in words is "sixty-one billion, five hundred twenty-one million, one hundred twenty thousand, one hundred fifty-seven".