157645261 has 8 divisors (see below), whose sum is σ = 171296000. Its totient is φ = 144529920.

The previous prime is 157645253. The next prime is 157645277. The reversal of 157645261 is 162546751.

It is a happy number.

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 157645261 - 2³ = 157645253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157645261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157645231) 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, 133236 + ... + 134413.

It is an arithmetic number, because the mean of its divisors is an integer number (21412000).

Almost surely, 2^157645261 is an apocalyptic number.

It is an amenable number.

157645261 is a deficient number, since it is larger than the sum of its proper divisors (13650739).

157645261 is a wasteful number, since it uses less digits than its factorization.

157645261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267699.

The product of its digits is 50400, while the sum is 37.

The square root of 157645261 is about 12555.6864009898. The cubic root of 157645261 is about 540.2071233345.

It can be divided in two parts, 15764 and 5261, that added together give a square (21025 = 145²).

The spelling of 157645261 in words is "one hundred fifty-seven million, six hundred forty-five thousand, two hundred sixty-one".