151611663521 has 8 divisors (see below), whose sum is σ = 151724839464. Its totient is φ = 151498529280.

The previous prime is 151611663517. The next prime is 151611663547. The reversal of 151611663521 is 125366116151.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 80791809121 + 70819854400 = 284239^2 + 266120^2 .

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 151611663521 - 2² = 151611663517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151611663221) 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, 11573051 + ... + 11586143.

It is an arithmetic number, because the mean of its divisors is an integer number (18965604933).

Almost surely, 2^151611663521 is an apocalyptic number.

It is an amenable number.

151611663521 is a deficient number, since it is larger than the sum of its proper divisors (113175943).

151611663521 is a wasteful number, since it uses less digits than its factorization.

151611663521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20851.

The product of its digits is 32400, while the sum is 38.

Adding to 151611663521 its reverse (125366116151), we get a palindrome (276977779672).

The spelling of 151611663521 in words is "one hundred fifty-one billion, six hundred eleven million, six hundred sixty-three thousand, five hundred twenty-one".