1649943477 has 48 divisors (see below), whose sum is σ = 2988655488. Its totient is φ = 853856640.

The previous prime is 1649943461. The next prime is 1649943481. The reversal of 1649943477 is 7743499461.

1649943477 is a `hidden beast` number, since 164 + 9 + 9 + 4 + 3 + 477 = 666.

It is not a de Polignac number, because 1649943477 - 2⁴ = 1649943461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649943457) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24402 + ... + 62412.

It is an arithmetic number, because the mean of its divisors is an integer number (62263656).

Almost surely, 2^1649943477 is an apocalyptic number.

It is an amenable number.

1649943477 is a deficient number, since it is larger than the sum of its proper divisors (1338712011).

1649943477 is a wasteful number, since it uses less digits than its factorization.

1649943477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38090 (or 38087 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 1649943477 is about 40619.4962671868. The cubic root of 1649943477 is about 1181.6522571229.

The spelling of 1649943477 in words is "one billion, six hundred forty-nine million, nine hundred forty-three thousand, four hundred seventy-seven".