1515055861661 has 8 divisors (see below), whose sum is σ = 1577768711424. Its totient is φ = 1453208016960.

The previous prime is 1515055861643. The next prime is 1515055861673. The reversal of 1515055861661 is 1661685505151.

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 1515055861661 - 2⁶ = 1515055861597 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 (1515055861681) 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, 216247691 + ... + 216254696.

It is an arithmetic number, because the mean of its divisors is an integer number (197221088928).

Almost surely, 2^{1515055861661} is an apocalyptic number.

It is an amenable number.

1515055861661 is a deficient number, since it is larger than the sum of its proper divisors (62712849763).

1515055861661 is a wasteful number, since it uses less digits than its factorization.

1515055861661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432502531.

The product of its (nonzero) digits is 1080000, while the sum is 50.

The spelling of 1515055861661 in words is "one trillion, five hundred fifteen billion, fifty-five million, eight hundred sixty-one thousand, six hundred sixty-one".