157721650767 has 16 divisors (see below), whose sum is σ = 233816405760. Its totient is φ = 105078151800.

The previous prime is 157721650753. The next prime is 157721650787. The reversal of 157721650767 is 767056127751.

157721650767 is a `hidden beast` number, since 1 + 5 + 7 + 72 + 1 + 6 + 507 + 67 = 666.

It is not a de Polignac number, because 157721650767 - 2²³ = 157713262159 is a prime.

It is a super-2 number, since 2×157721650767² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157721650717) 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, 1892209 + ... + 1973802.

It is an arithmetic number, because the mean of its divisors is an integer number (14613525360).

Almost surely, 2^157721650767 is an apocalyptic number.

157721650767 is a deficient number, since it is larger than the sum of its proper divisors (76094754993).

157721650767 is a wasteful number, since it uses less digits than its factorization.

157721650767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3867531 (or 3867525 counting only the distinct ones).

The product of its (nonzero) digits is 4321800, while the sum is 54.

The spelling of 157721650767 in words is "one hundred fifty-seven billion, seven hundred twenty-one million, six hundred fifty thousand, seven hundred sixty-seven".