1256061654 has 48 divisors (see below), whose sum is σ = 2850316560. Its totient is φ = 414525600.

The previous prime is 1256061647. The next prime is 1256061683. The reversal of 1256061654 is 4561606521.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36292 + ... + 61880.

It is an arithmetic number, because the mean of its divisors is an integer number (59381595).

Almost surely, 2^1256061654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256061654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1425158280).

1256061654 is an abundant number, since it is smaller than the sum of its proper divisors (1594254906).

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

1256061654 is a wasteful number, since it uses less digits than its factorization.

1256061654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25707 (or 25695 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1256061654 is about 35440.9601167914. The cubic root of 1256061654 is about 1078.9557962870.

It can be divided in two parts, 125606 and 1654, that added together give a triangular number (127260 = T₅₀₄).

The spelling of 1256061654 in words is "one billion, two hundred fifty-six million, sixty-one thousand, six hundred fifty-four".