1861149539454 has 32 divisors (see below), whose sum is σ = 3850750743840. Its totient is φ = 598975641600.

The previous prime is 1861149539429. The next prime is 1861149539467. The reversal of 1861149539454 is 4549359411681.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8374734 + ... + 8594094.

It is an arithmetic number, because the mean of its divisors is an integer number (120335960745).

Almost surely, 2^{1861149539454} is an apocalyptic number.

1861149539454 is an abundant number, since it is smaller than the sum of its proper divisors (1989601204386).

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

1861149539454 is a wasteful number, since it uses less digits than its factorization.

1861149539454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268156.

The product of its digits is 18662400, while the sum is 60.

The spelling of 1861149539454 in words is "one trillion, eight hundred sixty-one billion, one hundred forty-nine million, five hundred thirty-nine thousand, four hundred fifty-four".