2651821623 has 48 divisors (see below), whose sum is σ = 4355819520. Its totient is φ = 1540036800.

The previous prime is 2651821607. The next prime is 2651821631. The reversal of 2651821623 is 3261281562.

2651821623 is a `hidden beast` number, since 2 + 6 + 5 + 1 + 8 + 21 + 623 = 666.

It is not a de Polignac number, because 2651821623 - 2⁴ = 2651821607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651821693) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 311913 + ... + 320301.

It is an arithmetic number, because the mean of its divisors is an integer number (90746240).

Almost surely, 2^2651821623 is an apocalyptic number.

2651821623 is a deficient number, since it is larger than the sum of its proper divisors (1703997897).

2651821623 is a wasteful number, since it uses less digits than its factorization.

2651821623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8540 (or 8537 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 2651821623 is about 51495.8408320517. The cubic root of 2651821623 is about 1384.1445142889.

The spelling of 2651821623 in words is "two billion, six hundred fifty-one million, eight hundred twenty-one thousand, six hundred twenty-three".