1621615606149 has 48 divisors (see below), whose sum is σ = 2753301547136. Its totient is φ = 830857927680.

The previous prime is 1621615606111. The next prime is 1621615606157. The reversal of 1621615606149 is 9416065161261.

It is not a de Polignac number, because 1621615606149 - 2⁷ = 1621615606021 is a prime.

It is a super-2 number, since 2×1621615606149² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1621615606098 and 1621615606107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621615607149) 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 47 ways as a sum of consecutive naturals, for example, 4185604 + ... + 4556589.

Almost surely, 2^{1621615606149} is an apocalyptic number.

It is an amenable number.

1621615606149 is a deficient number, since it is larger than the sum of its proper divisors (1131685940987).

1621615606149 is a wasteful number, since it uses less digits than its factorization.

1621615606149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8742298 (or 8742287 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 1621615606149 in words is "one trillion, six hundred twenty-one billion, six hundred fifteen million, six hundred six thousand, one hundred forty-nine".