2561346154 has 4 divisors (see below), whose sum is σ = 3842019234. Its totient is φ = 1280673076.

The previous prime is 2561346143. The next prime is 2561346223. The reversal of 2561346154 is 4516431652.

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

It can be written as a sum of positive squares in only one way, i.e., 2080728225 + 480617929 = 45615^2 + 21923^2 .

It is a super-2 number, since 2×2561346154² = 13120988241221183432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640336537 + ... + 640336540.

Almost surely, 2^2561346154 is an apocalyptic number.

2561346154 is a deficient number, since it is larger than the sum of its proper divisors (1280673080).

2561346154 is a wasteful number, since it uses less digits than its factorization.

2561346154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280673079.

The product of its digits is 86400, while the sum is 37.

The square root of 2561346154 is about 50609.7436666103. The cubic root of 2561346154 is about 1368.2204956332.

The spelling of 2561346154 in words is "two billion, five hundred sixty-one million, three hundred forty-six thousand, one hundred fifty-four".