1506535666551 has 6 divisors (see below), whose sum is σ = 2176107073920. Its totient is φ = 1004357111028.

The previous prime is 1506535666543. The next prime is 1506535666553. The reversal of 1506535666551 is 1556665356051.

It is a happy number.

It is not a de Polignac number, because 1506535666551 - 2³ = 1506535666543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1506535666553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83696425911 + ... + 83696425928.

It is an arithmetic number, because the mean of its divisors is an integer number (362684512320).

Almost surely, 2^{1506535666551} is an apocalyptic number.

1506535666551 is a deficient number, since it is larger than the sum of its proper divisors (669571407369).

1506535666551 is a wasteful number, since it uses less digits than its factorization.

1506535666551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167392851845 (or 167392851842 counting only the distinct ones).

The product of its (nonzero) digits is 12150000, while the sum is 54.

The spelling of 1506535666551 in words is "one trillion, five hundred six billion, five hundred thirty-five million, six hundred sixty-six thousand, five hundred fifty-one".