1555606001649 has 16 divisors (see below), whose sum is σ = 2370499751808. Its totient is φ = 888898023552.

The previous prime is 1555606001639. The next prime is 1555606001659. The reversal of 1555606001649 is 9461006065551.

It is an interprime number because it is at equal distance from previous prime (1555606001639) and next prime (1555606001659).

It is not a de Polignac number, because 1555606001649 - 2⁸ = 1555606001393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1555606001598 and 1555606001607.

It is not an unprimeable number, because it can be changed into a prime (1555606001639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178339 + ... + 1772855.

It is an arithmetic number, because the mean of its divisors is an integer number (148156234488).

Almost surely, 2^{1555606001649} is an apocalyptic number.

It is an amenable number.

1555606001649 is a deficient number, since it is larger than the sum of its proper divisors (814893750159).

1555606001649 is a wasteful number, since it uses less digits than its factorization.

1555606001649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640984.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 1555606001649 in words is "one trillion, five hundred fifty-five billion, six hundred six million, one thousand, six hundred forty-nine".