1655791943 has 4 divisors (see below), whose sum is σ = 1783160568. Its totient is φ = 1528423320.

The previous prime is 1655791939. The next prime is 1655792003. The reversal of 1655791943 is 3491975561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3491975561 = 61 ⋅57245501.

It is a cyclic number.

It is not a de Polignac number, because 1655791943 - 2² = 1655791939 is a prime.

It is a super-3 number, since 3×1655791943³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1655791891 and 1655791900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655791903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63684293 + ... + 63684318.

It is an arithmetic number, because the mean of its divisors is an integer number (445790142).

Almost surely, 2^1655791943 is an apocalyptic number.

1655791943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1655791943 is a deficient number, since it is larger than the sum of its proper divisors (127368625).

1655791943 is a wasteful number, since it uses less digits than its factorization.

1655791943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127368624.

The product of its digits is 1020600, while the sum is 50.

The square root of 1655791943 is about 40691.4234575297. The cubic root of 1655791943 is about 1183.0467904666.

The spelling of 1655791943 in words is "one billion, six hundred fifty-five million, seven hundred ninety-one thousand, nine hundred forty-three".