2605021654 has 4 divisors (see below), whose sum is σ = 3907532484. Its totient is φ = 1302510826.

The previous prime is 2605021651. The next prime is 2605021663. The reversal of 2605021654 is 4561205062.

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

It is a super-2 number, since 2×2605021654² = 13572275635617791432, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605021651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651255412 + ... + 651255415.

It is an arithmetic number, because the mean of its divisors is an integer number (976883121).

Almost surely, 2^2605021654 is an apocalyptic number.

2605021654 is a deficient number, since it is larger than the sum of its proper divisors (1302510830).

2605021654 is a wasteful number, since it uses less digits than its factorization.

2605021654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302510829.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 2605021654 is about 51039.4127513239. The cubic root of 2605021654 is about 1375.9535695500.

The spelling of 2605021654 in words is "two billion, six hundred five million, twenty-one thousand, six hundred fifty-four".