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6542143621 = 132233154293
BaseRepresentation
bin1100001011111000…
…10011000010000101
3121212221012022220121
412011330103002011
5101344242043441
63001100501541
7321056206006
oct60574230205
917787168817
106542143621
112857962372
121326b4a8b1
138034b8300
15284527dd1
hex185f13085

6542143621 has 24 divisors (see below), whose sum is σ = 7630695936. Its totient is φ = 5589904320.

The previous prime is 6542143591. The next prime is 6542143627. The reversal of 6542143621 is 1263412456.

It is not a de Polignac number, because 6542143621 - 217 = 6542012549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6542143627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93351 + ... + 147643.

It is an arithmetic number, because the mean of its divisors is an integer number (317945664).

Almost surely, 26542143621 is an apocalyptic number.

It is an amenable number.

6542143621 is a deficient number, since it is larger than the sum of its proper divisors (1088552315).

6542143621 is a wasteful number, since it uses less digits than its factorization.

6542143621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54373 (or 54360 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 6542143621 is about 80883.5188465487. The cubic root of 6542143621 is about 1870.2802654084.

The spelling of 6542143621 in words is "six billion, five hundred forty-two million, one hundred forty-three thousand, six hundred twenty-one".