1861878991742 has 32 divisors (see below), whose sum is σ = 3539036772864. Its totient is φ = 713515471200.

The previous prime is 1861878991723. The next prime is 1861878991769. The reversal of 1861878991742 is 2471998781681.

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, 99089978 + ... + 99108765.

It is an arithmetic number, because the mean of its divisors is an integer number (110594899152).

Almost surely, 2^{1861878991742} is an apocalyptic number.

1861878991742 is a deficient number, since it is larger than the sum of its proper divisors (1677157781122).

1861878991742 is a wasteful number, since it uses less digits than its factorization.

1861878991742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198198824.

The product of its digits is 97542144, while the sum is 71.

The spelling of 1861878991742 in words is "one trillion, eight hundred sixty-one billion, eight hundred seventy-eight million, nine hundred ninety-one thousand, seven hundred forty-two".