2099621556078 has 32 divisors (see below), whose sum is σ = 4211911625760. Its totient is φ = 697765499520.

The previous prime is 2099621556037. The next prime is 2099621556079. The reversal of 2099621556078 is 8706551269902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2099621556079) 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, 2361168 + ... + 3126396.

It is an arithmetic number, because the mean of its divisors is an integer number (131622238305).

Almost surely, 2^{2099621556078} is an apocalyptic number.

2099621556078 is an abundant number, since it is smaller than the sum of its proper divisors (2112290069682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2099621556078 is a wasteful number, since it uses less digits than its factorization.

2099621556078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766612.

The product of its (nonzero) digits is 16329600, while the sum is 60.

The spelling of 2099621556078 in words is "two trillion, ninety-nine billion, six hundred twenty-one million, five hundred fifty-six thousand, seventy-eight".