1531505661157 has 4 divisors (see below), whose sum is σ = 1598092863840. Its totient is φ = 1464918458476.

The previous prime is 1531505661097. The next prime is 1531505661167. The reversal of 1531505661157 is 7511665051351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1531505661157 - 2⁷ = 1531505661029 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 (1531505661167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33293601307 + ... + 33293601352.

It is an arithmetic number, because the mean of its divisors is an integer number (399523215960).

Almost surely, 2^{1531505661157} is an apocalyptic number.

It is an amenable number.

1531505661157 is a deficient number, since it is larger than the sum of its proper divisors (66587202683).

1531505661157 is an equidigital number, since it uses as much as digits as its factorization.

1531505661157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66587202682.

The product of its (nonzero) digits is 472500, while the sum is 46.

The spelling of 1531505661157 in words is "one trillion, five hundred thirty-one billion, five hundred five million, six hundred sixty-one thousand, one hundred fifty-seven".