1161621655507 has 4 divisors (see below), whose sum is σ = 1162421121280. Its totient is φ = 1160822189736.

The previous prime is 1161621655463. The next prime is 1161621655609. The reversal of 1161621655507 is 7055561261611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1161621655507 - 2²⁷ = 1161487437779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161621655307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399730707 + ... + 399733612.

It is an arithmetic number, because the mean of its divisors is an integer number (290605280320).

Almost surely, 2^{1161621655507} is an apocalyptic number.

1161621655507 is a deficient number, since it is larger than the sum of its proper divisors (799465773).

1161621655507 is an equidigital number, since it uses as much as digits as its factorization.

1161621655507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799465772.

The product of its (nonzero) digits is 378000, while the sum is 46.

The spelling of 1161621655507 in words is "one trillion, one hundred sixty-one billion, six hundred twenty-one million, six hundred fifty-five thousand, five hundred seven".