2661029553 has 144 divisors (see below), whose sum is σ = 4854951936. Its totient is φ = 1267643520.

The previous prime is 2661029521. The next prime is 2661029561. The reversal of 2661029553 is 3559201662.

2661029553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2661029553 - 2⁵ = 2661029521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661029513) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 39716826 + ... + 39716892.

It is an arithmetic number, because the mean of its divisors is an integer number (33714944).

Almost surely, 2^2661029553 is an apocalyptic number.

It is an amenable number.

2661029553 is a deficient number, since it is larger than the sum of its proper divisors (2193922383).

2661029553 is a wasteful number, since it uses less digits than its factorization.

2661029553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 2661029553 is about 51585.1679555277. The cubic root of 2661029553 is about 1385.7447202821.

The spelling of 2661029553 in words is "two billion, six hundred sixty-one million, twenty-nine thousand, five hundred fifty-three".